Hydrangea plant named ‘hse1735301’

ABSTRACT

A new and distinct cultivar of Hydrangea plant named ′HSE1735301′, characterized by its upright to broadly spreading plant habit; freely branching habit; strong and sturdy stems; dark green-colored leaves; freely flowering habit; lace-cap inflorescences with white to greenish white-colored sterile flowers and light violet-colored fertile flowers; and good garden performance.

Cultivar denomination: ‘HSE1735301’.

Botanical designation: Hydrangea serrata.

CROSS-REFERENCED TO CLOSELY-RELATED APPLICATIONS

A Provisional U.S. Pat. application for this plant was filed by theInventor on Mar. 17, 2022, application serial number 63/321,093.Priority is claimed to this Provisional U.S. Pat. application.

An European Community Plant Breeder’s Rights application for this plantwas filed by the Applicant/Assignee of the instant application, KwekerijLendert de Vos of Reeuwijk, The Netherlands on Jan. 25, 2022,application number 2022/0236. Foreign priority is not claimed to thisEuropean Plant Breeder’s Rights application.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar ofHydrangea plant, botanically known as Hydrangea serrata, commerciallyreferred to as a Mountain Hydrangea, and hereinafter referred to by thename ′HSE1735301′.

The new Hydrangea plant is a product of a planned breeding programconducted by the Inventor in Reeuwijk, The Netherlands. The objective ofthe breeding program is to create new compact and strong Hydrangeaplants with attractive inflorescences and good postproduction longevity.

The new Hydrangea plant originated from a cross-pollination conducted bythe Inventor during the summer of 2016 of a proprietary selection ofHydrangea serrata identified as code number 12-00-203, not patented, asthe female, or seed, parent with a proprietary selection of Hydrangeaserrata identified as code number 12-00-205, not patented, as the male,or pollen, parent. The new Hydrangea plant was discovered and selectedas a single flowering plant from within the progeny of the statedcross-pollination in a controlled greenhouse environment in Reeuwijk,The Netherlands in August, 2017.

Asexual reproduction of the new Hydrangea plant by terminal vegetativecuttings since August, 2018 in a controlled greenhouse environment inReeuwijk, The Netherlands has shown that the unique features of this newHydrangea plant are stable and reproduced true to type in successivegenerations of asexual reproduction.

SUMMARY OF THE NEW PLANT

Plants of the new Hydrangea have not been observed under all possiblecombinations of environmental conditions and cultural practices. Thephenotype may vary somewhat with variations in environmental conditionssuch as temperature and light intensity, without, however, any variancein genotype.

The following traits have been repeatedly observed and are determined tobe the unique characteristics of ′HSE1735301′. These characteristics incombination distinguish ′HSE173S301′ as a new and distinct Hydrangeaplant:

1. Upright to broadly spreading plant habit.

2. Freely branching habit.

3. Strong and sturdy stems.

4. Dark green-colored leaves.

5. Freely flowering habit.

6. Lace-cap inflorescences with white to greenish white-colored sterileflowers and light violet-colored fertile flowers.

7. Good garden performance.

Plants of the new Hydrangea can be compared to plants of the femaleparent selection. Plants of the new Hydrangea differ primarily fromplants of the female parent selection in the following characteristics:

1. Leaves of plants of the new Hydrangea are darker green in color thanleaves of plants of the female parent selection.

2. Sterile flowers of plants of the new Hydrangea are white to greenishwhite in color whereas sterile flowers of plants of the female parentselection are light pink in color.

3. Apices of sterile flowers of plants of the new Hydrangea are moreacute than and not as rounded as apices of sterile flowers of plants ofthe female parent selection.

Plants of the new Hydrangea can be compared to plants of the male parentselection. Plants of the new Hydrangea differ primarily from plants ofthe male parent selection in the following characteristics:

1. Leaves of plants of the new Hydrangea are darker green in color thanleaves of plants of the male parent selection.

2. Sterile flowers of plants of the new Hydrangea are white to greenishwhite in color whereas sterile flowers of plants of the male parentselection are light pink in color.

3. Apices of sterile flowers of plants of the new Hydrangea are moreacute than and not as rounded as apices of sterile flowers of plants ofthe male parent selection.

Plants of the new Hydrangea can be compared to plants of Hydrangeaserrata ‘Bluebird’, not patented. In side-by-side comparisons, plants ofthe new Hydrangea differ primarily from plants of ‘Bluebird’ in thefollowing characteristics:

1. Leaves of plants of the new Hydrangea are darker green in color thanleaves of plants of ‘Bluebird’.

2. Sterile flowers of plants of the new Hydrangea are white to greenishwhite in color whereas sterile flowers of plants of ‘Bluebird’ arebluish pink in color.

3. Apices of sterile flowers of plants of the new Hydrangea are moreacute than and not as rounded as apices of sterile flowers of plants of‘Bluebird’.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying colored photographs illustrate the unique appearance ofthe new Hydrangea plant showing the colors as true as it is reasonablypossible to obtain in colored reproductions of this type. Colors in thephotographs may differ from the color values cited in the detailedbotanical description which accurately describe the colors of the newHydrangea plant. The photograph on the first sheet (FIG. 1 ) is a sideperspective view of a typical flowering plant of ′HSE1735301′ grown in acontainer. The photograph at the top of the second sheet (FIG. 2 ) is aclose-up view of a typical inflorescence of ′HSE1735301′. The photographat the bottom of the second sheet (FIG. 3 ) is a close-up view of atypical leaf of ′HSE1735301′.

DETAILED BOTANICAL DESCRIPTION

Plants used in the aforementioned photographs and in the followingdescription were grown during the summer in 13-cm containers in anoutdoor nursery in Reeuwijk, The Netherlands and under culturalpractices typical of commercial Hydrangea production. During theproduction of the plants, day temperatures ranged from 16° C. to 30° C.,night temperatures ranged from 8° C. to 18° C. Plants of the newHydrangea were pinched in the early summer. Plants were two years oldwhen the photographs and description were taken. In the followingdescription, color references are made to The Royal HorticulturalSociety Colour Chart, 2015 Edition, except where general terms ofordinary dictionary significance are used. Mountain Hydrangea plants arenot typically treated with aluminum sulfate to “blue” the flower color.

-   Botanical description:    -   Hydrangea serrata ′HSE1735301′.-   Parentage:    -   Female, or seed, patent.—Proprietary selection of Hydrangea        serrata identified as code number 12-00-203, not patented. Male,        or pollen, patent: Proprietary selection of Hydrangea serrata        identified as code number 12-00-205, not patented.-   Propagation:    -   Type cutting.—By vegetative terminal cuttings.    -   Time to initiate roots, summer.—About 16 days at temperatures        ranging from 20° C. to 30° C.    -   Time to produce a rooted young plant, summer.—About four months        at temperatures ranging from 20° C. to 30° C.    -   Root description.—Medium in thickness; fibrous; typically light        brown in color, actual color of the roots is dependent on        substrate composition, water quality, fertilizer type and        formulation, substrate temperature and physiological age of        roots.    -   Rooting habit.—Freely branching; dense.-   Plant description:    -   Plant and growth habit.—Upright to broadly outwardly spreading        and mounding plant habit; flattened globular in overall shape;        strong and sturdy stems; moderately vigorous growth habit and        moderate growth rate; about six months from planting rooted        young plants are required to produce small finished plants.        Plant height: About 39.5 cm.    -   Plant diameter or area of spread.—About 53.5 cm.-   Lateral branch description:    -   Branching habit.—Freely branching habit with about nine lateral        branches developing per plant; pinching is not required, but        will enhance lateral branch development.    -   Length.—About 27.9 cm.    -   Diameter.—About 4 mm.    -   Internode length.—About 7 cm.    -   Strength.—Strong, sturdy.    -   Aspect.—Erect to about 65° from vertical.    -   Texture.—Smooth, glabrous; becoming woody with subsequent        development.    -   Color, developing.—Close to 143B.    -   Color, fully developed.—Close to 144A and at the internodes,    -   close to 178A; when woody, close to 200C and 200D.    -   Lenticels.—Density: Moderate. Length: About 1.5 mm. Width: About        4 mm. Color: Close to 178A.-   Leaf description:    -   Arrangement.—Opposite, simple.    -   Length.—About 13.4 cm.    -   Width.—About 5.1 cm.    -   Shape.—Narrowly elliptic to narrowly oblong.    -   Apex.—Narrowly apiculate.    -   Base.—Short attenuate.    -   Margin.—Serrate.    -   Texture, upper surface.—Slightly rugose, glabrous.    -   Texture, lower surface.—Moderately rugose, glabrous.    -   Venation pattern.—Pinnate.    -   Color.—Developing leaves, upper surface: Close to 138A.        Developing leaves, lower surface: Close to a blend of 144A and        146C. Fully developed leaves, upper surface: Close to NN137A to        darker than NN137A; towards the margins, tinged with close to        200B; venation, close to 146A. Fully developed leaves, lower        surface: Close to 148B; venation, close to 146B.    -   Petioles.—Length: About 1.45 cm. Diameter: About 2.5 mm. Texture        and luster, upper and lower surfaces: Smooth, glabrous; slightly        glossy. Color, upper surface: Close to 146A to 146B; proximally,        tinged with close to 178A. Color, lower surface: Close to 146B;        proximally, tinged. with close to N199B.-   Flower description:    -   Flower type and habit.—Showy rotate sterile and fertile flowers        arranged on terminal panicles; panicles flattened lacecap in        shape with fertile flowers at the center of the inflorescence        surrounded with outer sterile flowers; sterile flowers face        upright, outwardly to eventually drooping and fertile flowers        face mostly upright. Fragrance: Moderately fragrant; somewhat        moldy.    -   Natural flowering season.—In the garden, plants flower        continuously from the early summer to late summer in The        Netherlands.    -   Flower longevity.—Good postproduction longevity; sterile flowers        maintain good substance for about six weeks on the plant,        sterile flowers persistent; fertile flowers last for about five        days on the plant, fertile flowers not persistent.    -   Quantity of flowers.—Freely flowering habit; about 7 to 14        sterile flowers and about 150 fertile flowers per panicle.    -   Panicle height.—About 8.3 cm.    -   Panicle diameter.—About 15.7 cm.    -   Panicle peduncles.—Length: About 4 cm. Diameter: About 2 mm.        Strength: Strong. Aspect: Primary peduncles, mostly erect;        lateral peduncles, about 40° from primary peduncle axis. Texture        and luster: Moderately to densely pubescent; matte. Color: Close        to 147C.    -   Sterile flower buds.—Length: About 1.2 cm. Diameter: About 9 mm.        Shape: Narrowly cup-shaped. Color: Close to N155A.    -   Fertile flower buds.—Length: About 5 mm. Diameter: About 3 mm.        Shape: Obovate. Color: Close to 85D and proximally, close to        150D. .    -   Sterile flower diameter.—About 5.7 cm.    -   Sterile flower depth (height).—About 8 mm.    -   Fertile flower diameter.—About 9 mm.    -   Fertile flower depth (height).—About 6 mm.    -   Petals, sterile flowers.—Quantity and arrangement: Four in a        single whorl. Length: About 3 mm. Width: About 2 mm. Shape:        Ovate; concave. Apex: Acute. Base: Cuneate. Margin: Entire.        Texture and luster, upper and lower surfaces: Smooth, glabrous;        matte. Color: When opening, upper and lower surfaces: Close to        85D and proximally, tinged with close to 98C. .Fully opened,        upper and lower surfaces: Close to 85D and proximally, tinged        with close to 98C to 98D; color does not change with subsequent        development.    -   Petals, fertile flowers.—Quantity and arrangement: Five in a        single whorl. Length: About 3 mm. Width: About 2 mm. Shape:        Ovate, concave. Apex: Acute. Base: Cuneate. Margin: Entire.        Texture and luster, upper and lower surfaces: Smooth, glabrous;        matte. Color: When opening, upper surface: Close to 85D and        proximally, tinged with close to 98C. .When opening, lower        surface: Close to 85D and proximally, slightly tinged with close        to 98D. .Fully opened, upper and lower surfaces: Close to 85D        and proximally, slightly tinged with close to 98D; color does        not change with subsequent development.    -   Sepals, sterile flowers.—Quantity and arrangement: Typically        four, or occasionally five, arranged in a single whorl. Length:        About 3 cm. Width: About 2.3 cm. Shape: Broadly elliptic to        close to rhomboidal; flat. Apex: Short apiculate to abruptly        acute. Base: Cuneate. Margin: Crenate; slightly undulate.        Texture and luster, upper and lower surfaces: Smooth, glabrous;        matte. Color: When opening, upper and lower surfaces: Close to        NN155A. Fully opened, upper surface: Close to 157C and towards        the margins, close to NN155C; with subsequent development, color        becoming closer to 145B. Fully opened, lower surface: Close to        157B and towards the margins, close to NN155B; with subsequent        development, color becoming closer to 145B.    -   Sepals, fertile flowers.—Quantity and arrangement: Five in a        single whorl. .Length: About 1 mm. Width: About 1 mm. Shape:        Deltoid. Apex: Broadly acute. Base: Broadly cuneate. Margin:        Entire. Texture and luster, upper and lower surfaces: Smooth,        glabrous; matte. Color: When opening and fully opened, upper        surface: Close to 150D slightly tinged with close to N170D;        color does notchange with subsequent development. .When opening        and fully opened, lower surface: Close to 150D slightly tinged        with close to N170D; color does not change with subsequent        development. .    -   Pedicels, sterile flowers.—Length: About 2.7 cm. Diameter: About        1 mm. Strength: Moderately strong. Aspect: About 25° from main        peduncle axis. Texture and luster: Densely pubescent; matte.        .Color: Close to 146D.    -   Pedicels, fertile flowers.—Length: About 2 mm. Diameter: About        1 mm. Strength: Moderately strong. Aspect: About 20° from        vertical. Texture and luster: Smooth, glabrous; matte. Color:        Close to 85D tinged with close to 150D. Reproductive organs,        sterile flowers: Stamens: Quantity per flower: About ten.        Filament length: About 2 mm. Filament color: Close to N88B.        Anther shape: Broadly double oblong. Anther length: About        0.75 mm. Anther color: Close to 94C to 94D. Pollen amount:        Sparse. Pollen color: Close to NN155B. Pistils: Pistil quantity        per flower: Three, or occasionally, two. Pistil length: About        1 mm. Stigma shape: Club-shaped. Stigma color: Close to 192A.        Style length: About 0.5 mm. Style color: Close to 92C. Ovary        color: Close to 92A. .    -   Reproductive organs, fertile flowers.—Stamens: Quantity per        flower: Ten. Filament length: About 2 mm. Filament color: Close        to NN155D. Anther shape: Broadly double oblong. Anther length:        About 0.8 mm. Anther color: Close to 102D to lighter than 102D.        Pollen amount: Sparse. Pollen color: Close to NN155B. Pistils:        Pistil quantity per flower: Three, or occasionally, four. Pistil        length: About 1 mm. Stigma shape: Club-shaped. Stigma color:        Close to 92A. Style length: About 0.5 mm. Style color: Close to        92C. Ovary color: Close to 150D.    -   Seeds.—To date, seed development has not been observed on plants        of the new Hydrangea.-   Pathogen & pest resistance:    -   Plants of the new Hydrangea have not been observed to be        resistant to pathogens and pests common to Hydrangea plants.-   Temperature tolerance:    -   Plants of the new Hydrangea have been shown to be suitable for        USDA Hardiness Zones 5 through 9.

It is claimed:
 1. A new and distinct Hydrangea plant named ′HSE1735301′as illustrated and described.